Related Experiment Video
Updated: Dec 26, 2025
11:27
Studying DNA Looping by Single-Molecule FRET
Published on: June 28, 2014
15.8K
DNA looping by two 5-methylcytosine-binding proteins quantified using nanofluidic devices
Ming Liu1, Saeid Movahed1, Saroj Dangi1
1Department of Physics, North Carolina State University, Raleigh, NC, 27695-8202, USA.
Epigenetics & Chromatin
|March 18, 2020
Summary
Methyl-CpG-binding domain protein 2 (MeCP2) compacts DNA by forming bridges and loops, unlike MBD2. ATTO 565-labeled MBD2 shows potential for epigenetic mapping.
Area of Science:
- Molecular Biology
- Epigenetics
- Biophysics
Background:
- MeCP2 and MBD2 are proteins binding 5-methylcytosine in CpG sites.
- These proteins interact with others to influence DNA packing.
- Nanofluidic channels enable probing protein-induced DNA compaction.
Purpose of the Study:
- To investigate the DNA compaction mechanisms of MeCP2 and MBD2.
- To compare the effects of these related proteins on DNA structure.
- To evaluate MBD2 as a potential epigenetic mapping agent.
Main Methods:
- DNA stretching in nanofluidic channels.
- Atomic Force Microscopy (AFM) for structural analysis.
- Utilizing ATTO 565-labeled MBD2.
Main Results:
- MeCP2 significantly compacts DNA.
- MBD2 binding does not alter DNA configuration.
- MeCP2 compaction occurs via DNA bridging and loop formation.
Conclusions:
- Full-length 5-methylcytosine-binding proteins exhibit varied DNA interaction effects.
- MeCP2 strongly compacts DNA, while MBD2 shows no large-scale impact.
- ATTO 565-labeled MBD2 is a promising tool for epigenetic mapping.
